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			<h1>Java 8 函数式接口</h1>
<p><a href="java8-new-features.html"><img decoding="async" class="navup" src="/images/up.gif" alt="Java 8 新特性"> Java 8 新特性</a></p>
<hr>


<p>函数式接口(Functional Interface)就是一个有且仅有一个抽象方法，但是可以有多个非抽象方法的接口。</p>
<p>函数式接口可以被隐式转换为 lambda 表达式。</p>

<p>Lambda 表达式和方法引用（实际上也可认为是Lambda表达式）上。</p>

<p>如定义了一个函数式接口如下：</p>

<pre>@FunctionalInterface
interface GreetingService 
{
    void sayMessage(String message);
}</pre>
<p>那么就可以使用Lambda表达式来表示该接口的一个实现(注：JAVA 8 之前一般是用匿名类实现的)：</p>

<pre>GreetingService greetService1 = message -&gt; System.out.println("Hello " + message);</pre>

<p>函数式接口可以对现有的函数友好地支持 lambda。</p>
<p>
JDK 1.8 之前已有的函数式接口:</p>
<ul>
<li>java.lang.Runnable</li>
<li>java.util.concurrent.Callable</li>
<li>java.security.PrivilegedAction</li>
<li>java.util.Comparator</li>
<li>java.io.FileFilter</li>
<li>java.nio.file.PathMatcher</li>
<li>java.lang.reflect.InvocationHandler</li>
<li>java.beans.PropertyChangeListener</li>
<li>java.awt.event.ActionListener</li>
<li>javax.swing.event.ChangeListener</li>
</ul>
<p>JDK 1.8 新增加的函数接口：</p>
<ul>
<li>java.util.function</li>
</ul>
<p>java.util.function 它包含了很多类，用来支持 Java的 函数式编程，该包中的函数式接口有：</p>
<table class="reference">
<tbody><tr>
<th style="width:10%;">序号</th>
<th>接口 &amp; 描述</th>
</tr>
<tr>
<td>1</td>
<td><b>BiConsumer&lt;T,U&gt;</b>
<p>代表了一个接受两个输入参数的操作，并且不返回任何结果</p>
</td>
</tr>
<tr>
<td>2</td>
<td><b>BiFunction&lt;T,U,R&gt;</b>
<p>代表了一个接受两个输入参数的方法，并且返回一个结果</p>
</td>
</tr>
<tr>
<td>3</td>
<td><b>BinaryOperator&lt;T&gt;</b>
<p>代表了一个作用于于两个同类型操作符的操作，并且返回了操作符同类型的结果</p>
</td>
</tr>
<tr>
<td>4</td>
<td><b>BiPredicate&lt;T,U&gt;</b>
<p>代表了一个两个参数的boolean值方法</p>
</td>
</tr>
<tr>
<td>5</td>
<td><b>BooleanSupplier</b>
<p>代表了boolean值结果的提供方</p>
</td>
</tr>
<tr>
<td>6</td>
<td><b>Consumer&lt;T&gt;</b>
<p>代表了接受一个输入参数并且无返回的操作</p>
</td>
</tr>
<tr>
<td>7</td>
<td><b>DoubleBinaryOperator</b>
<p>代表了作用于两个double值操作符的操作，并且返回了一个double值的结果。</p>
</td>
</tr>
<tr>
<td>8</td>
<td><b>DoubleConsumer</b>
<p>代表一个接受double值参数的操作，并且不返回结果。</p>
</td>
</tr>
<tr>
<td>9</td>
<td><b>DoubleFunction&lt;R&gt;</b>
<p>代表接受一个double值参数的方法，并且返回结果

</p>
</td>
</tr>
<tr>
<td>10</td>
<td><b>DoublePredicate</b>
<p>代表一个拥有double值参数的boolean值方法</p>
</td>
</tr>
<tr>
<td>11</td>
<td><b>DoubleSupplier</b>
<p>代表一个double值结构的提供方</p>
</td>
</tr>
<tr>
<td>12</td>
<td><b>DoubleToIntFunction</b>
<p>接受一个double类型输入，返回一个int类型结果。</p>
</td>
</tr>
<tr>
<td>13</td>
<td><b>DoubleToLongFunction</b>
<p>接受一个double类型输入，返回一个long类型结果 </p>
</td>
</tr>
<tr>
<td>14</td>
<td><b>DoubleUnaryOperator</b>
<p>接受一个参数同为类型double,返回值类型也为double 。 </p>
</td>
</tr>
<tr>
<td>15</td>
<td><b>Function&lt;T,R&gt;</b>
<p> 接受一个输入参数，返回一个结果。</p>
</td>
</tr>
<tr>
<td>16</td>
<td><b>IntBinaryOperator</b>
<p>接受两个参数同为类型int,返回值类型也为int 。</p>
</td>
</tr>
<tr>
<td>17</td>
<td><b>IntConsumer</b>
<p>接受一个int类型的输入参数，无返回值 。</p>
</td>
</tr>
<tr>
<td>18</td>
<td><b>IntFunction&lt;R&gt;</b>
<p>接受一个int类型输入参数，返回一个结果 。</p>
</td>
</tr>
<tr>
<td>19</td>
<td><b>IntPredicate</b>
<p>：接受一个int输入参数，返回一个布尔值的结果。 </p>
</td>
</tr>
<tr>
<td>20</td>
<td><b>IntSupplier</b>
<p>无参数，返回一个int类型结果。 </p>
</td>
</tr>
<tr>
<td>21</td>
<td><b>IntToDoubleFunction</b>
<p>接受一个int类型输入，返回一个double类型结果 。</p>
</td>
</tr>
<tr>
<td>22</td>
<td><b>IntToLongFunction</b>
<p>接受一个int类型输入，返回一个long类型结果。</p>
</td>
</tr>
<tr>
<td>23</td>
<td><b>IntUnaryOperator</b>
<p>接受一个参数同为类型int,返回值类型也为int 。</p>
</td>
</tr>
<tr>
<td>24</td>
<td><b>LongBinaryOperator</b>
<p>接受两个参数同为类型long,返回值类型也为long。</p>
</td>
</tr>
<tr>
<td>25</td>
<td><b>LongConsumer</b>
<p>接受一个long类型的输入参数，无返回值。</p>
</td>
</tr>
<tr>
<td>26</td>
<td><b>LongFunction&lt;R&gt;</b>
<p>接受一个long类型输入参数，返回一个结果。</p>
</td>
</tr>
<tr>
<td>27</td>
<td><b>LongPredicate</b>
<p>R接受一个long输入参数，返回一个布尔值类型结果。</p>
</td>
</tr>
<tr>
<td>28</td>
<td><b>LongSupplier</b>
<p>无参数，返回一个结果long类型的值。</p>
</td>
</tr>
<tr>
<td>29</td>
<td><b>LongToDoubleFunction</b>
<p>接受一个long类型输入，返回一个double类型结果。</p>
</td>
</tr>
<tr>
<td>30</td>
<td><b>LongToIntFunction</b>
<p>接受一个long类型输入，返回一个int类型结果。</p>
</td>
</tr>
<tr>
<td>31</td>
<td><b>LongUnaryOperator</b>
<p>接受一个参数同为类型long,返回值类型也为long。</p>
</td>
</tr>
<tr>
<td>32</td>
<td><b>ObjDoubleConsumer&lt;T&gt;</b>
<p>接受一个object类型和一个double类型的输入参数，无返回值。</p>
</td>
</tr>
<tr>
<td>33</td>
<td><b>ObjIntConsumer&lt;T&gt;</b>
<p>接受一个object类型和一个int类型的输入参数，无返回值。</p>
</td>
</tr>
<tr>
<td>34</td>
<td><b>ObjLongConsumer&lt;T&gt;</b>
<p>接受一个object类型和一个long类型的输入参数，无返回值。</p>
</td>
</tr>
<tr>
<td>35</td>
<td><b>Predicate&lt;T&gt;</b>
<p>接受一个输入参数，返回一个布尔值结果。</p>
</td>
</tr>
<tr>
<td>36</td>
<td><b>Supplier&lt;T&gt;</b>
<p>无参数，返回一个结果。</p>
</td>
</tr>
<tr>
<td>37</td>
<td><b>ToDoubleBiFunction&lt;T,U&gt;</b>
<p>接受两个输入参数，返回一个double类型结果</p>
</td>
</tr>
<tr>
<td>38</td>
<td><b>ToDoubleFunction&lt;T&gt;</b>
<p>接受一个输入参数，返回一个double类型结果</p>
</td>
</tr>
<tr>
<td>39</td>
<td><b>ToIntBiFunction&lt;T,U&gt;</b>
<p>接受两个输入参数，返回一个int类型结果。</p>
</td>
</tr>
<tr>
<td>40</td>
<td><b>ToIntFunction&lt;T&gt;</b>
<p>接受一个输入参数，返回一个int类型结果。</p>
</td>
</tr>
<tr>
<td>41</td>
<td><b>ToLongBiFunction&lt;T,U&gt;</b>
<p>接受两个输入参数，返回一个long类型结果。</p>
</td>
</tr>
<tr>
<td>42</td>
<td><b>ToLongFunction&lt;T&gt;</b>
<p>接受一个输入参数，返回一个long类型结果。</p>
</td>
</tr>
<tr>
<td>43</td>
<td><b>UnaryOperator&lt;T&gt;</b>
<p>接受一个参数为类型T,返回值类型也为T。</p>
</td>
</tr>
</tbody></table>

<hr>
<h2>函数式接口实例</h2>
<p>Predicate &lt;T&gt; 接口是一个函数式接口，它接受一个输入参数 T，返回一个布尔值结果。</p>
<p>该接口包含多种默认方法来将Predicate组合成其他复杂的逻辑（比如：与，或，非）。</p>
<p>该接口用于测试对象是 true 或 false。</p>
<p>我们可以通过以下实例（Java8Tester.java）来了解函数式接口 Predicate &lt;T&gt; 的使用：</p>
<div class="example"> 
<h2 class="example">Java8Tester.java 文件</h2> 
<div class="example_code">
<div class="hl-main"><span class="hl-reserved">import</span><span class="hl-code"> </span><span class="hl-identifier">java</span><span class="hl-code">.</span><span class="hl-identifier">util</span><span class="hl-code">.</span><span class="hl-identifier">Arrays</span><span class="hl-code">;
</span><span class="hl-reserved">import</span><span class="hl-code"> </span><span class="hl-identifier">java</span><span class="hl-code">.</span><span class="hl-identifier">util</span><span class="hl-code">.</span><span class="hl-identifier">List</span><span class="hl-code">;
</span><span class="hl-reserved">import</span><span class="hl-code"> </span><span class="hl-identifier">java</span><span class="hl-code">.</span><span class="hl-identifier">util</span><span class="hl-code">.</span><span class="hl-identifier">function</span><span class="hl-code">.</span><span class="hl-identifier">Predicate</span><span class="hl-code">;
 
</span><span class="hl-reserved">public</span><span class="hl-code"> </span><span class="hl-reserved">class</span><span class="hl-code"> </span><span class="hl-identifier">Java8Tester</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
   </span><span class="hl-reserved">public</span><span class="hl-code"> </span><span class="hl-types">static</span><span class="hl-code"> </span><span class="hl-types">void</span><span class="hl-code"> </span><span class="hl-identifier">main</span><span class="hl-brackets">(</span><span class="hl-identifier">String</span><span class="hl-code"> </span><span class="hl-identifier">args</span><span class="hl-brackets">[</span><span class="hl-brackets">]</span><span class="hl-brackets">)</span><span class="hl-brackets">{</span><span class="hl-code">
      </span><span class="hl-identifier">List</span><span class="hl-code">&lt;</span><span class="hl-identifier">Integer</span><span class="hl-code">&gt; </span><span class="hl-identifier">list</span><span class="hl-code"> = </span><span class="hl-identifier">Arrays</span><span class="hl-code">.</span><span class="hl-identifier">asList</span><span class="hl-brackets">(</span><span class="hl-number">1</span><span class="hl-code">, </span><span class="hl-number">2</span><span class="hl-code">, </span><span class="hl-number">3</span><span class="hl-code">, </span><span class="hl-number">4</span><span class="hl-code">, </span><span class="hl-number">5</span><span class="hl-code">, </span><span class="hl-number">6</span><span class="hl-code">, </span><span class="hl-number">7</span><span class="hl-code">, </span><span class="hl-number">8</span><span class="hl-code">, </span><span class="hl-number">9</span><span class="hl-brackets">)</span><span class="hl-code">;
        
      </span><span class="hl-comment">//</span><span class="hl-comment"> Predicate&lt;Integer&gt; predicate = n -&gt; true</span><span class="hl-comment"></span><span class="hl-code">
      </span><span class="hl-comment">//</span><span class="hl-comment"> n 是一个参数传递到 Predicate 接口的 test 方法</span><span class="hl-comment"></span><span class="hl-code">
      </span><span class="hl-comment">//</span><span class="hl-comment"> n 如果存在则 test 方法返回 true</span><span class="hl-comment"></span><span class="hl-code">
        
      </span><span class="hl-identifier">System</span><span class="hl-code">.</span><span class="hl-identifier">out</span><span class="hl-code">.</span><span class="hl-identifier">println</span><span class="hl-brackets">(</span><span class="hl-quotes">&quot;</span><span class="hl-string">输出所有数据:</span><span class="hl-quotes">&quot;</span><span class="hl-brackets">)</span><span class="hl-code">;
        
      </span><span class="hl-comment">//</span><span class="hl-comment"> 传递参数 n</span><span class="hl-comment"></span><span class="hl-code">
      </span><span class="hl-identifier">eval</span><span class="hl-brackets">(</span><span class="hl-identifier">list</span><span class="hl-code">, </span><span class="hl-identifier">n</span><span class="hl-code">-&gt;</span><span class="hl-reserved">true</span><span class="hl-brackets">)</span><span class="hl-code">;
        
      </span><span class="hl-comment">//</span><span class="hl-comment"> Predicate&lt;Integer&gt; predicate1 = n -&gt; n%2 == 0</span><span class="hl-comment"></span><span class="hl-code">
      </span><span class="hl-comment">//</span><span class="hl-comment"> n 是一个参数传递到 Predicate 接口的 test 方法</span><span class="hl-comment"></span><span class="hl-code">
      </span><span class="hl-comment">//</span><span class="hl-comment"> 如果 n%2 为 0 test 方法返回 true</span><span class="hl-comment"></span><span class="hl-code">
        
      </span><span class="hl-identifier">System</span><span class="hl-code">.</span><span class="hl-identifier">out</span><span class="hl-code">.</span><span class="hl-identifier">println</span><span class="hl-brackets">(</span><span class="hl-quotes">&quot;</span><span class="hl-string">输出所有偶数:</span><span class="hl-quotes">&quot;</span><span class="hl-brackets">)</span><span class="hl-code">;
      </span><span class="hl-identifier">eval</span><span class="hl-brackets">(</span><span class="hl-identifier">list</span><span class="hl-code">, </span><span class="hl-identifier">n</span><span class="hl-code">-&gt; </span><span class="hl-identifier">n</span><span class="hl-code">%</span><span class="hl-number">2</span><span class="hl-code"> == </span><span class="hl-number">0</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">;
        
      </span><span class="hl-comment">//</span><span class="hl-comment"> Predicate&lt;Integer&gt; predicate2 = n -&gt; n &gt; 3</span><span class="hl-comment"></span><span class="hl-code">
      </span><span class="hl-comment">//</span><span class="hl-comment"> n 是一个参数传递到 Predicate 接口的 test 方法</span><span class="hl-comment"></span><span class="hl-code">
      </span><span class="hl-comment">//</span><span class="hl-comment"> 如果 n 大于 3 test 方法返回 true</span><span class="hl-comment"></span><span class="hl-code">
        
      </span><span class="hl-identifier">System</span><span class="hl-code">.</span><span class="hl-identifier">out</span><span class="hl-code">.</span><span class="hl-identifier">println</span><span class="hl-brackets">(</span><span class="hl-quotes">&quot;</span><span class="hl-string">输出大于 3 的所有数字:</span><span class="hl-quotes">&quot;</span><span class="hl-brackets">)</span><span class="hl-code">;
      </span><span class="hl-identifier">eval</span><span class="hl-brackets">(</span><span class="hl-identifier">list</span><span class="hl-code">, </span><span class="hl-identifier">n</span><span class="hl-code">-&gt; </span><span class="hl-identifier">n</span><span class="hl-code"> &gt; </span><span class="hl-number">3</span><span class="hl-code"> </span><span class="hl-brackets">)</span><span class="hl-code">;
   </span><span class="hl-brackets">}</span><span class="hl-code">
    
   </span><span class="hl-reserved">public</span><span class="hl-code"> </span><span class="hl-types">static</span><span class="hl-code"> </span><span class="hl-types">void</span><span class="hl-code"> </span><span class="hl-identifier">eval</span><span class="hl-brackets">(</span><span class="hl-identifier">List</span><span class="hl-code">&lt;</span><span class="hl-identifier">Integer</span><span class="hl-code">&gt; </span><span class="hl-identifier">list</span><span class="hl-code">, </span><span class="hl-identifier">Predicate</span><span class="hl-code">&lt;</span><span class="hl-identifier">Integer</span><span class="hl-code">&gt; </span><span class="hl-identifier">predicate</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
      </span><span class="hl-reserved">for</span><span class="hl-brackets">(</span><span class="hl-identifier">Integer</span><span class="hl-code"> </span><span class="hl-identifier">n</span><span class="hl-code">: </span><span class="hl-identifier">list</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
        
         </span><span class="hl-reserved">if</span><span class="hl-brackets">(</span><span class="hl-identifier">predicate</span><span class="hl-code">.</span><span class="hl-identifier">test</span><span class="hl-brackets">(</span><span class="hl-identifier">n</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
            </span><span class="hl-identifier">System</span><span class="hl-code">.</span><span class="hl-identifier">out</span><span class="hl-code">.</span><span class="hl-identifier">println</span><span class="hl-brackets">(</span><span class="hl-identifier">n</span><span class="hl-code"> + </span><span class="hl-quotes">&quot;</span><span class="hl-string"> </span><span class="hl-quotes">&quot;</span><span class="hl-brackets">)</span><span class="hl-code">;
         </span><span class="hl-brackets">}</span><span class="hl-code">
      </span><span class="hl-brackets">}</span><span class="hl-code">
   </span><span class="hl-brackets">}</span><span class="hl-code">
</span><span class="hl-brackets">}</span></div>
</div>
</div>
<p>执行以上脚本，输出结果为：</p>
<pre>
$ javac Java8Tester.java 
$ java Java8Tester
输出所有数据:
1 
2 
3 
4 
5 
6 
7 
8 
9 
输出所有偶数:
2 
4 
6 
8 
输出大于 3 的所有数字:
4 
5 
6 
7 
8 
9 
</pre>

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	<ol class="commentlist">
		<li class="comment even thread-even depth-1" id="comment-34337"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;erichuang</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;eri***su@qq.com</p></div><div id="runoobvote-id-34337" data-commid = "34337" class="upvotejs"><a class="upvote"></a> <span class="count">39</span></div></div><div class="comt-main" id="div-comment-34337"><p>eval 函数可以写为如下格式：</p>

<pre>private static void eval(List&lt;Integer&gt; list, Predicate&lt;Integer&gt; predicate) {
    list.stream().filter(predicate).forEach(System.out::println);
}</pre>
<p>或者直接可以不用定义 eval 函数，使用:</p>

<pre>list.stream().filter(n -&gt; n &gt; 3).forEach(System.out::println);</pre>
<p>来输出所有大于 3 的数字。</p><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">erichuang</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;erichuang</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;eri***su@qq.com</p></div></span>5年前 (2018-08-23)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-36538"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;hezhite</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;152***14785@163.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://www.cnblogs.com/runningTurtle/p/7092632.html">&nbsp;&nbsp;参考地址</a></p></div><div id="runoobvote-id-36538" data-commid = "36538" class="upvotejs"><a class="upvote"></a> <span class="count">27</span></div></div><div class="comt-main" id="div-comment-36538"><p><strong>关于 @FunctionalInterface 注解</strong></p>
<p>Java 8为函数式接口引入了一个新注解@FunctionalInterface，主要用于编译级错误检查，加上该注解，当你写的接口不符合函数式接口定义的时候，编译器会报错。</p>

<p>正确例子，没有报错：</p>

<pre>@FunctionalInterface
interface GreetingService
{
    void sayMessage(String message);
}</pre>

<p>错误例子，接口中包含了两个抽象方法，违反了函数式接口的定义，Eclipse 报错提示其不是函数式接口。</p>
<p><img src="//www.runoob.com/wp-content/uploads/2018/11/16092307421970.png"></p>

<p><strong>提醒：</strong>加不加 <strong>@FunctionalInterface</strong> 对于接口是不是函数式接口没有影响，该注解只是提醒编译器去检查该接口是否仅包含一个抽象方法
</p>
<p><strong>函数式接口里允许定义默认方法</strong></p>
<p>函数式接口里是可以包含默认方法，因为默认方法不是抽象方法，其有一个默认实现，所以是符合函数式接口的定义的；</p>

<p>如下代码不会报错：</p>

<pre>@FunctionalInterface
interface GreetingService
{
    void sayMessage(String message);

    default void doSomeMoreWork1()
    {
        // Method body
    }

    default void doSomeMoreWork2()
    {
        // Method body
    }
}</pre>

<p><strong>函数式接口里允许定义静态方法</strong></p>
<p>函数式接口里是可以包含静态方法，因为静态方法不能是抽象方法，是一个已经实现了的方法，所以是符合函数式接口的定义的；</p>

<p>如下代码不会报错：</p>

<pre>@FunctionalInterface
interface GreetingService 
{
    void sayMessage(String message);
    static void printHello(){
        System.out.println("Hello");
    }
}</pre>

<p><strong>函数式接口里允许定义 java.lang.Object 里的 public 方法</strong></p>
<p>函数式接口里是可以包含Object里的public方法，这些方法对于函数式接口来说，不被当成是抽象方法（虽然它们是抽象方法）；因为任何一个函数式接口的实现，默认都继承了 Object 类，包含了来自 java.lang.Object 里对这些抽象方法的实现；</p>

<p>如下代码不会报错：</p>

<pre>@FunctionalInterface
interface GreetingService  
{
    void sayMessage(String message);
    
    @Override
    boolean equals(Object obj);
}</pre>

<div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">hezhite</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;hezhite</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;152***14785@163.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://www.cnblogs.com/runningTurtle/p/7092632.html">&nbsp;&nbsp;参考地址</a></p></div></span>5年前 (2018-11-02)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-48385"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;xingjian long</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;tdl***tju.edu.cn</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://www.cnblogs.com/greatLong/p/11851252.html">&nbsp;&nbsp;参考地址</a></p></div><div id="runoobvote-id-48385" data-commid = "48385" class="upvotejs"><a class="upvote"></a> <span class="count">3</span></div></div><div class="comt-main" id="div-comment-48385"><h3>java.util.function 包</h3>
<p>Java 8 的 java.util.function 包里面有很多内置的函数式接口。</p>

<p><strong>Predicate</strong> : Predicate 接口包含一个抽象方法 test, test 方法会对输入的参数做一个评判，输出一个布尔值作为评判结果，至于评判的 criteria 交给具体的实现去做。Predicate 的函数原型如下:</p>
<pre>public interface Predicate
{
    public boolean test(T  t);
}</pre>
<p><strong>BinaryOperator</strong>: 见名知意，BinaryOperator 是一个二元输入的函数式接口，它包含一个 apply 抽象方法，接收两个相同类型的参数，返回一个与输入类型相同的结果。</p>
<pre>public interface BinaryOperator 
{
    public T apply(T x, T y);
} </pre>  
<p><strong>Function</strong>: Function 接口有一个抽象方法 apply, 接收一个类型T的输入，返回一个类型 R 的结果。这个名字也很体现用途，Function 是函数的意思，函数的作用就是将定义域映射到值域的操作。这里 T 就是定义域，R 是值域。映射关系交给具体实现去定义。</p>
public interface Function 
<pre>{
    public R apply(T t);
}</pre>
<p>示例程序：</p>
<pre>// A simple program to demonstrate the use 
// of predicate interface 
import java.util.*; 
import java.util.function.Predicate; 
  
class Test 
{ 
    public static void main(String args[]) 
    { 
  
        // create a list of strings 
        List&lt;String&gt; names = 
            Arrays.asList("Geek","GeeksQuiz","g1","QA","Geek2"); 
  
        // declare the predicate type as string and use 
        // lambda expression to create object 
        Predicate&lt;String&gt; p = (s)-&gt;s.startsWith("G"); 
  
        // Iterate through the list 
        for (String st:names) 
        { 
            // call the test method 
            if (p.test(st)) 
                System.out.println(st); 
        } 
    } 
}</pre><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">xingjian long</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;xingjian long</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;tdl***tju.edu.cn</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://www.cnblogs.com/greatLong/p/11851252.html">&nbsp;&nbsp;参考地址</a></p></div></span>4年前 (2019-11-13)</div></div></li><!-- #comment-## -->
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